ORIGINAL: Xairflyer
I would just replace the components that look iffy, when getting the N06HD's remember to get the TO263 case rather than the more common T0220 style
Good call

One big question ? where is the microprocessor

anyway just looking on both side of the board and notice the burn PART could be an AUX output or a GAS or FUEL valve driver (could be wrong)
P.S is the ecu a kero start or Propane start. Burn parts on another board is (f D024 45 G)